GL 4.4, GLSL 4.40 -- all DONE: i965/gen8+, nvc0, radeonsi
GL_MAX_VERTEX_ATTRIB_STRIDE DONE (all drivers)
- GL_ARB_buffer_storage DONE (i965, nv50, r600)
+ GL_ARB_buffer_storage DONE (i965, nv50, r600, llvmpipe, swr)
GL_ARB_clear_texture DONE (i965, nv50, r600, llvmpipe, softpipe)
GL_ARB_enhanced_layouts DONE (i965, nv50, llvmpipe, softpipe)
- compile-time constant expressions DONE